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NCP308SN280T1G Datasheet(PDF) 8 Page - ON Semiconductor

Part # NCP308SN280T1G
Description  Low Quiescent Current, Programmable Delay Time Supervisory Circuit
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP308SN280T1G Datasheet(HTML) 8 Page - ON Semiconductor

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NCP308, NCV308
www.onsemi.com
8
NCP308XX330
SENSE
CT
GND
VDD
NCP308XX120
SENSE
CT
GND
VDD
3.3 V
DSP/
RESET
1.2 V
Figure 13.
Using MR to Monitor Multiple System Voltages
MR
RESET
Processor
MR
RESET
Setting Reset Delay Time
The NCP308 has three options for setting the reset delay
time as shown in Table 5. Figure 14 shows the configuration
for a fixed 300 ms typical delay time by tying CT to VDD;
a resistor from 40 k
W to 200 kW must be used. Figure 15
shows a fixed 20 ms delay time by leaving the CT pin
unconnected.
Figure 16 shows a user−defined program time between
1.25 ms and 10 s by connecting a capacitor between CT pin
and ground.
3.3 V
MR
Rpullup
SENSE
CT
GND
VDD
50k
Figure 14. Delay Time Fixed to 300 ms when CT
Connected to VDD by Resistor
MR
RESET
3.3V
MR
Rpullup
SENSE
CT
GND
VDD
Figure 15. Delay Time Fixed to 20 ms when CT is
Open
MR
RESET
3.3 V
MR
Rpullup
SENSE
CT
GND
VDD
CT
Figure 16. Delay Time Set by Capacitor
MR
RESET
The capacitor CT should be
≥ 100 pF for NCP308 to
recognize that the capacitor is present. The capacitor value
for a given delay time can be calculated using the following
equation:


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